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Chapter 12

Chapter 12. Choosing interaction devices: hardware components. Introduction. Every user interface consists of a mixture of design components Hardware components: also known as I/O devices, or interaction devices Software components: generated by the underlying computer program.

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Chapter 12

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  1. Chapter 12 Choosing interaction devices: hardware components

  2. Introduction • Every user interface consists of a mixture of design components • Hardware components: also known as I/O devices, or interaction devices • Software components: generated by the underlying computer program

  3. Choosing Interaction Devices • Interaction devices are tools used to complete a job • To choose between devices, you need to ask the right questions • Questions are driven by constraints of the technology and by the uses to which the technology will be put

  4. Input Devices • Keyboards, keypads & buttons • Pointing devices

  5. Input Devices • Keyboards, keypads & buttons • Discrete input devices: can be used to enter individual items of information • Questions: • What size do the keys need to be? • What shape should the keyboard be? • How robust does the keyboard need to be? • Which keys/buttons are needed and how should they be labeled?

  6. Input Devices • Pointing Devices • Continuous input devices: good at tasks that cannot be split easily into a number of discrete steps • 2 types: • Indirect: require the user to move a screen cursor using a secondary device • Direct: allow user to point directly at the relevant position on the screen

  7. Input Devices • Pointing Devices • Questions: • How easy to learn does the device need to be? • How accurate does the device need to be? • How much time will the user spend on the system? • How much space is there? • How robust does the device need to be? • How manually dexterous is the user?

  8. Input Devices • Alternative Approaches • Gesture • Iris & fingerprint recognition • Eyetracking • Handwriting recognition • Speech recognition

  9. Output Devices • Screens • Loudspeakers • Simple output devices

  10. Output Devices • Screens • Most common • Can represent a wide variety of visual elements • CRTs & LCDs

  11. Output Devices • Screens • Questions • How detailed does the image need to be? • How many colors are needed? • How large does the screen need to be? • Does the screen need to be portable? • How much space is there?

  12. Output Devices • Loudspeakers • Questions • How are the speakers going to be used?

  13. Output Devices • Simple output devices • Lights, dials, gauges and buzzers • Questions • Will the data being output be better represented in analog or digital form?

  14. Output Devices • Alternative approaches • Head-up displays • Head-mounted displays (virtual reality systems) • Stereoscopic displays

  15. Questions?

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